Coaster-brake hub.



W. T. CARTER.

COASTER BRAKE HUB.

APPLICATION FILED DBO. 1a. 1912.

1,117,975. 1 Patented 1\I0v..24,1914.`

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W. T. CARTER.

GOASTER BRAKE HUB.

ArPLIcATIoN FILED DB0. 1s. 1912.

1,1 17,975. Patented N0v.24, 1914.

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'HHHIIIIIll-UIIH WALTER T. CARTER, OF LOS ANGELES, GALIFORNIA.

i COASTEFHBRAKE HUB.

Speoincation of Letters Patent.

Patented Nov. 24, 1914.

Application med December 18, 1912. Serial Eo. 737,359'.

To all 'whom 'it may concern:

Be it known that I, WALTER T. CARTER,

a citizen ofthe United States, residing at Los Angeles, county of LosAngeles, California, have invented certain new and useful Improvementsin Coaster-Brake Hubs, of which the following is a full, clear, and eXact description.

My invention relates to an improved coaster brakeconstruction, theobject being to simplify the construction and reduce the parts requiredto the fewest possible number, which parts are of such substantial sizeas to afford the maximum strength and durability.l

In the accompanying-drawings Figure 1 is a plan view of a coaster bralrehub as 1t would appear in place. Fig. 2 is a longitudinal centralsection of the same. Fig. 3 is a central longitudinal section of theshell, withthe other parts' detached. Fig. 4 1s an end elevation oftheshell shown Fig. 3, looking from right to left. Fig. 5 is an endelevation of the driver element, detached. Fig. 6 is a side elevationthereof. Fig. 7 is a cross section of a detail. Fig. 8 1s an endelevation thereof.

1 represents the shell of the hub, having the usual spoke-receivingflanges 2 2.

3 is a central arbor on which are mounted the cones 4 5.

6 6 are balls for the ball bearing which is supported on the cone 4, theadjacent end of the hub shell 1 being provided with a cupped race-way 7to receive the balls .6.

8 is a driver, so-called, usually provided with' sprocket or gear teeth.Tins driver has a ball-race in one end and is mounted upon the balls 9,which in turn are supported upon the cone 5. The driver has a centralforward extension which has spiral threads 10 thereon.

11 are balls which support that end of the hub shell 1 adjacent to thedriver 8, suitable 45 ball races being provided in each of said elementsfor said balls 11. The cone 4 has .a forward extension provided withlongitudinal splines 12, for the purpose hereinafter described.

13 is an arm on the cone 4, which arm may be suitably locked to theframe of the bicycle, so that said cone cannot rotate and willconstitute what I may term a stationary abutment or fixed anchorage.

14 is a barrel-shaped member which constitutes both a coupler and abrake, and

which I will term the clutch device. In its former capacity it couplesthe driver with the hub shell 1 so that the latter may be driven. In itslatter capacity it is lockedagainst turning and simultaneousl engageswith the hub shell to'friction-ally rake the same. The shell 1 isprovided with a suiioiently large chamber to receive the clutch device14 which moves longitudinally therein on the spiral 10, the interior ofthe clutch device 14 having corresponding threads which mesh with the'spiral threads 10. The opposite end of the member 14 is provided withsuitable splines l2 arranged to engage with the splines 12; on the fixedanchorage abutment at theA proper time.

15 is an annular ring which is arranged to lit into the end of the shell1 between the driver 8 and the clutch device 14. Thisl annulus 15 isprovided with suitable splines 1b and the interior of the shell isprovided with corresponding grooves to receive said splines whereby saidannular member 15l may' be readily inserted into its operative positionin the end of the shell. The inner wall of the shell at the end adjacentthe stationary abutment cone 6 is provided with atapered seat tocorrespond with the taper of the adjacent'endl of the clutch device 14,while the inner wall of the annulus 15 is oppositely tapered tocorrespond with the tapered wall of the adjacent end of said clutchdevice 14. By preference the annulus. 15 has a slight degree oflong'tudinal: motion inthe shell 1.

17 represents the end of a C-shaped drag spring which presses outwardlyagainst the inner wall of the shell and partially surrounds the clutchdevice 14, the end 17 projecting into a groove in said clutch device 14so that said spring performs the usual function common to drag springsin devices of this character.

In the preferred construction the driver is provided with an abutmentshoulder 18, best seen in Fig. 6, which acts as a stop for the annularmember 15, limiting its` movement to the right.

When the parts are in the position shown in Fig. 2, which illustratesthe driving position, it willl be seen that the forward turning of thedriver has 4drawn the clutch device 14 to theright into engagement withthe annular member 15. Since the latter is splined or otherwise heldagainst rotation in the hub shell 1, it cannot turn independently of theshell, and hence the forward ma; c minera rotation ot the driver 8 willimpart a corresponding rotation to the hub shell 1. lf the driver 8 isrotated in the reverse direction, it immediately imparts a shiftingmovement to the clutch device 14 in a direction to the left, Which'disengages it from the annulus 15 and brings it into engagement with thesplines 12 on the stationary abutment, the splines 12a' sliding thereonas the member 14 is moved to the left. This left hand movement oftheclutch device 1li may carry with it for a very short distance the ringl5, which quickly comes up against an abutment or knock oil' shoulder 19Within the shell 1, best seen in Fig. 3. rl`he slight shock of engagingthis shoulder 19 tends to knock oli' the engagement between the ring 15and the clutch device 14. When the clutch device 14C has been movedsuiiciently far to the left, its tapered left hand end engages thecorrespondingly tapered seat in the inner Wall of the shell 1 so as tofrictionally retard the rotation of the shell, since the clutch devicelll at such a time cannot turn, owing to its engagement with the splines12 on the fixed anchorage. rlhe ordinary adjustments may be provided,the

adjustment of the bearings being ordinarilyeffected through the mediumof the cone 5, which customarily is screw-threaded upon the arbor 3. ltWill be seen that by providing the removable ring-like member 15, va-

rious parts may be readily assembled, ample room being provided for theinsertion into the shell 1 of the relatively large clutch member 111-.

l/Vhat ll claim is:

1. In a coaster brake hub, a hub shell having an internal tapered seatat one end and a knock-01T shoulder near its opposite end, a ringinsertible Within the opposite end of vsaid shell by longitudinalmovement and means for holding the same against rotation independentlyof the shell, said knock-off shoulder being so located relatively tosaid ring as to permit of a slight longitudinal movement of the latterWithin said shell, said ring having a tapered seat arranged on anincline opposite to the first mentioned tapered seat, a clutch memberlongitudinally movable between said tapered seats to engage one or theother independently, a driver operatively connected with said clutch forshifting the same longitudinally of the hub shell, means for holdingsaid clutch member against rotation when in engagement With one of saidinclined4 seats and being free of said clutch member when the latter isin engagement with the other of said seats.

2. In a coaster brake hub, a hub shell, a driver entering said shellfrom one end, a clutch member carried thereby and operatively connectedtherewith for limited longitudinal and rotary movement relativelythereto, an internal tapered seat at one end of said shell arranged tobe frictionally engaged by said clutch member and means Within thevsbellto hold said lclutch member against rotation when in engagement withsaid seat, an internal knock-oil shoulder Within the shell toward itsopposite end, a ring insertible Within said opposite end of the shelland arranged to cooperate with said knock-0H shoulder, means to causesaid ring to revolve with said hub shell, said ring having a limitedlongitudinal movement Within said shell, said clutch member beingarranged to make operative connection with said ring, said clutch memberbeing free to rotate with the driver when in operative engagement Withsaid ring.

WALTER. T. CARTER. Witnesses v E. W. DEIBLER. 0. H. PARKE.

